Magnets are ideal for an oral viva because one short follow-up can expose whether the pupil is using a real rule or a memorised phrase.
A pupil may say “like poles repel” correctly and still believe that every attracted object is a magnet, that North is always on the left, or that the centre of a bar magnet is non-magnetic. This Oral Viva checks the relationships beneath the words.
The conversation stays within the Primary 3 magnet scope: magnetic and non-magnetic materials, North and South poles, attraction and repulsion, strongest magnetic effect near the poles, freely suspended magnets, everyday uses and simple magnet-making methods.
Wait, What? “Magnets Attract” Is Not a Complete Rule
Ask, “What happens when two magnets meet?” A child says, “They attract.” Now ask, “What if N faces N?” If the child still says “attract”, the first answer was an overgeneralisation.
Strong magnet reasoning names the condition: like poles repel; unlike poles attract.
Viva Set 1: Pole Rules
Ask: “What happens when N faces N?”
Expected answer: Repel.
Follow-up: “What about S facing S? N facing S?”
- S–S → repel;
- N–S → attract.
Misconception if weak: The child has memorised examples rather than the like/unlike rule.
Viva Set 2: Rotate the Magnet
Ask: “A magnet has N on its left end. I rotate the magnet so that end points downward. What pole is now at the bottom?”
Expected answer: N.
Probe: “Why did it not become S?”
Strong reasoning: Pole identity belongs to the physical end of the magnet; page position does not change it.
Viva Set 3: Attraction to a Paper Clip
Ask: “A steel paper clip is attracted to a magnet. Is the paper clip definitely a magnet?”
Expected answer: No.
Probe: “What can you say?”
Strong reasoning: The paper clip contains/is made from magnetic material. Attraction alone does not prove permanent magnet identity.
Viva Set 4: Unknown Bar
Ask: “A known N pole attracts Unknown Bar X. What are two possible explanations?”
- X could be magnetic material.
- X could be a magnet with S facing.
Probe: “What should you say if the question asks whether X is definitely a magnet?”
Expected answer: Cannot determine from attraction alone; more evidence is needed.
Viva Set 5: Best Next Test
Ask: “What test would help distinguish a magnet from ordinary magnetic material?”
Expected reasoning: Use a known pole and test whether an end of the unknown bar can repel it. Repulsion is more discriminating evidence of magnet behaviour.
Diagnostic value: This tests whether the pupil can design a test that separates two explanations.
Viva Set 6: Hidden Pole From Repulsion
Ask: “A known N pole repels hidden end X of a confirmed magnet. What is X?”
Expected answer: N.
Probe: “What is the opposite end?”
Expected answer: S.
Probe: “Explain the two steps.”
Strong reasoning: Repulsion with N identifies X as N because like poles repel; the opposite end of the bar magnet is S.
Viva Set 7: All Metals?
Ask: “Are all metals magnetic?”
Expected answer: No.
Probe: “Then how should you decide whether an unknown object is attracted?”
Strong reasoning: Use the given material information or test with a known magnet; do not decide from shiny appearance.
Viva Set 8: Strongest Magnetic Effect
Ask: “Where is the magnetic effect strongest on a bar magnet?”
Expected answer: Near the poles/ends.
Probe: “Does that mean the centre is not part of the magnet?”
Expected answer: No. The effect is weaker there, not necessarily zero.
Viva Set 9: Strongest-Effect Fair Test
Ask: “A pupil uses a large clip at the centre and a small clip at the pole. Is that a good comparison?”
Expected answer: No.
Probe: “What should stay similar?”
Strong reasoning: Use identical or comparable test objects and the same basic method so position on the magnet is the main changed factor.
Viva Set 10: North Versus South Strength
Ask: “Is North the stronger pole?”
Expected answer: No. The P3 model says effect is strongest near both pole regions compared with the centre.
Misconception if weak: The directional label North is being interpreted as “main” or “stronger”.
Viva Set 11: Freely Suspended Magnet
Ask: “What happens when a bar magnet is suspended so it can turn freely?”
Expected answer: It settles roughly North–South.
Probe: “Why must it be free to turn?”
Strong reasoning: So the directional behaviour can appear instead of being blocked by the setup.
Viva Set 12: Compass
Ask: “How does a compass use a magnet?”
Weak answer: “It has a magnet.”
Strong reasoning: A freely turning magnetic part aligns roughly North–South, helping indicate direction.
Viva Set 13: Magnetic Catch
Ask: “How does a magnetic catch help keep a door closed?”
Expected answer: The magnet attracts the magnetic part, helping hold the door closed.
Probe: “Does the whole door need to be magnetic?”
Expected answer: No. The relevant interacting parts matter.
Viva Set 14: Making a Magnet
Ask: “If you follow the stroking method, can you immediately say the object became a magnet?”
Expected answer: No. The result should be tested.
Probe: “What kind of evidence would you look for?”
Strong reasoning: Test for magnet behaviour rather than assuming the procedure succeeded.
Viva Set 15: Electrical Method Safety
Ask: “What is the safe boundary for an electrical magnet-making activity?”
Expected answer: Use appropriate school-approved low-voltage equipment under adult supervision; never use household mains electricity.
Viva Set 16: Observation Versus Inference
Ask: “The two magnets moved apart. Observation or inference?”
Expected answer: Observation.
Probe: “If the poles were hidden and both objects are confirmed magnets, what might you infer?”
Expected reasoning: Like poles were facing.
Viva Set 17: Must, Could or Cannot
Known N attracts X.
Ask: “Must X be a magnet, could it be a magnet, or can it not be a magnet?”
Expected answer: It could be a magnet, but could also be magnetic material.
Known N repels one end of confirmed Magnet Y.
Ask: “What must that end be?”
Expected answer: N in the simple P3 pole model.
Viva Set 18: Three-Magnet Chain
A left = N, so A right = S. A right repels B left.
Ask: “What is B left? What is B right?”
Expected answer: B left = S; B right = N.
Probe: “Why solve one interaction at a time?”
Strong reasoning: Each inferred pole becomes the evidence for the next step.
The 30-Second Magnet Probe
- “Are both objects confirmed magnets?”
- “Attract or repel?”
- “What can that interaction prove—and what can it not prove?”
The One-Minute Viva Ladder
- Rule: State like/unlike behaviour.
- Status: Identify magnet, magnetic material or unknown.
- Evidence: Use attraction/repulsion correctly.
- Inference: Solve one hidden pole.
- Boundary: State when more evidence is needed.
How to Score the Magnet Viva
- Secure: applies pole rules in any orientation, distinguishes material from magnet, and recognises ambiguous attraction.
- Developing: knows rules but loses accuracy in hidden-pole or fair-test follow-ups.
- Fragile: depends on colour, left/right position or “magnets attract”.
- Needs repair: reverses like/unlike rules or treats any attracted object as a magnet.
Teacher Use: Make the Rule Survive a Change
After a correct N–S answer, rotate the magnet, hide one pole, then replace one confirmed magnet with an unknown bar. Each change tests whether the child knows which conditions are required for the rule.
Parent Use: Ask “What Else Could Explain It?”
When the child sees attraction, ask for another explanation. This one prompt is powerful because it prevents attraction from becoming automatic proof of magnet identity.
Viva Challenge Round
- What happens when N faces N?
- Does rotating a magnet change pole identity?
- Why is an attracted paper clip not necessarily a magnet?
- What two explanations fit attraction to an unknown bar?
- What test is more discriminating than attraction?
- Where is magnetic effect strongest?
- Why should identical clips be used in that comparison?
- Why must a suspended magnet be free to turn?
- How does a compass use magnetic behaviour?
- What safety rule applies to electrical magnet-making?
Primary 3 Oral Viva Mastery Check
- I know like poles repel and unlike poles attract.
- I track pole identity after rotation.
- I distinguish magnet from magnetic material.
- I know attraction alone can be ambiguous.
- I can use repulsion as stronger evidence of magnet behaviour.
- I can infer hidden poles step by step.
- I know magnetic effect is strongest near the poles.
- I can explain a fairer strongest-effect test.
- I understand North–South directional behaviour.
- I can state when more evidence is needed.
Continue the Primary 3 Science Oral Viva Series
- Living Things, Classification & Evidence
- Materials, Properties & Fair Tests
- Life Cycles, Diagrams & Comparisons
Return to the Primary 3 Science Learning Hub.
Source and Syllabus Alignment
This oral diagnostic guide is aligned to the Singapore Ministry of Education Science Teaching & Learning Syllabus: Primary Three to Six, especially P3 interaction of forces (magnets) and scientific practices including predicting, observing, comparing, investigating, inferring and communicating.
